linux-imx

/*

 * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/dmaengine.h>

#include <crypto/scatterwalk.h>

​

#include "dma.h"

​

int qce_dma_request(struct device *dev, struct qce_dma_data *dma)

{

    int ret;

​

    dma->txchan = dma_request_slave_channel_reason(dev, "tx");

    if (IS_ERR(dma->txchan))

        return PTR_ERR(dma->txchan);

​

    dma->rxchan = dma_request_slave_channel_reason(dev, "rx");

    if (IS_ERR(dma->rxchan)) {

        ret = PTR_ERR(dma->rxchan);

        goto error_rx;

    }

​

    dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ,

                  GFP_KERNEL);

    if (!dma->result_buf) {

        ret = -ENOMEM;

        goto error_nomem;

    }

​

    dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;

​

    return 0;

error_nomem:

    dma_release_channel(dma->rxchan);

error_rx:

    dma_release_channel(dma->txchan);

    return ret;

}

​

void qce_dma_release(struct qce_dma_data *dma)

{

    dma_release_channel(dma->txchan);

    dma_release_channel(dma->rxchan);

    kfree(dma->result_buf);

}

​

struct scatterlist *

qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl)

{

    struct scatterlist *sg = sgt->sgl, *sg_last = NULL;

​

    while (sg) {

        if (!sg_page(sg))